Over the phone, you’ll want to have your 1040 form handy, a prior tax return, and other tax information to help the IRS confirm your identity. You can also resolve a 5071C letter online through ...

You’ll receive Letter 5071C, asking you to verify your identity ... Then you must file IRS Form 14039, the Identity Theft Affidavit. Then the investigation process can take months.

The IRS has its own form of identity protection called the IP PIN — a six-digit number that is uniquely assigned to you (a new PIN each year), which you must use in all communications and when filing ...